Construction of induction electric furnaces.



PIATEENTED JAN. *7, 1908.-

G. GIN. CONSTRUCTION OF INDUCTION ELECTRIC FURNACES.

APYLIGA T ION FILED MAY 3, 1906.

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4 *r w w fincmiicfion of L st-tern Eatem.

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FRANCE.

' Patented Jan. 7, 190B.

,iloplicetion filcd May :8, 19906, Serial No. 315023:

uniform distinction of heel; and uniform reactions in different partsofthe furnscc on account of the smell calorific conductivity and slowdiffusloility of molten substances. A much more satisfactory effect me-ybe obmined by the employmenl'. of means for. re-

ducing a. conlzinubus circulation of the mo ten materials in thefurnace, thereby causing of thorouglrnixing of all their pcrtlcles'andconsiacncly renewing their contact surfaces with the reactive a onesemployed. circulation may be c )tained by forming rho channel crucibleof a succession of open channels or receptacles, the bottom cl"- eachbeing lorwitudinally sloping, and M connecting t ese channels orreccptec cs by means of laterally closed conduits connecting the deepend of each channel with the shallow portion of the adjacent channel.

T he Joule ellect which varies in an inverse ratio with the section ofrho-molten mass is less intense in the deep portion of lBlIG openchannels, As the two lrquid masses which communicate through closedconduits have different, densities on account of the (linen encc intemperatures, an upward n1ovement of the liquid molecules in the closedchannels is "produced. This displacement is still further reinforccd bythe nesting in the conduit" itself. From these partial dislaccments ageneral and continuous circa-- otion results throughout the whole moltcnmoss filling the channels.

In the drawing, in which like reference numerals lIld'lCtLlZG corresonding parts, Fig ures land 2 are respectively VQll-lfi l and hornzontal sectional views of c orocible con-- structed in accordance withmy invention, Fig. 1 being a section on line c--Z indicaced in Fi 2. 3and l are horizontel seotione views of modified forms of furnacesembodying my invention, the channels being curved.

In che drawings, A designates c furnace heertli of refractory,nonconmictivc Ina-terial, provided with a plurclib of open onnels as 1,2, 8, etc, indicate" the v9.-

figiures of the drawings. These channels;

ich nmy'be either straight or curved, as shown, are provided withlongitudinally sloping bottoms B. A series oflnclined, lat,- erollyclosed. conduits or flucs Q-conncci each of the 0 on channels with thead'acent ones,- the she. low end of each cha-nnc being-con nected wickthe deep end of the adjacent channel as clearly indicated in Fig. 1; 3 i

The hearth A is provided with a, centrally disposed opening D withinwhich extend portions of one or more electro magnets oimdnntors E,preferably'of the form and atrangemon'g illustrated. The elcctro magn'elE 15 provided with windings. F whichurecei vp current from a suitablesource, the electromagnet and winding being of the usual typo"eglploycdin. the art for producing the Joule e :ect

Inasmuch as the intensity of the Joule effect is inversely proportionalto the cross section of the molten mass, it will be seen that theortions of the'rrl'ctcl Within the inclined conduits or fines C; and inthe shallow orlions of the- 3l.uinnels 1, 2, 3, etc, wil be heated morere idly than the metal in the deep Fortion of these channels, andoonsequent y there will be 'a continuous 11 ward movement of the moltenmess within t e inclined conduits or flues O, resultin in a continuouscirculation of the m0 ten mass through the channels and conduits,thereby effecting a. thorough mixing of the molten particles andconstantly renewing their con-4 teotin surfcce with the reactiveagents.-

v Wln c Llmv'e illustrated my invention in connection with, threeembodiments only thereof, it is to be understood that such embodimentsmay be modified Within the 300 of the cppcnded claims without departingfrom the spirit of my invention.

Having now fully described my invention, I claim:

1. In a furnace of the W e set forth, ahecrbn provided with a, plum ityof receptoolcs for molten metal, each having a longitudinally inclinedbottom, laterell closed conduits connecting said rcceptcc es andelectrc-Incgnet'ic means adapted to set up an induced electric'currentin metal contained in said. receptacles and conduits, substantially .nsand for the purpose s ecified.-

2. In a furnace of t' e ty e set forth, a hearth provided with mplnrccity of rece tal clues for molten -.n1e"ual, united in on on less'system or crucible latcrelly olosedinclined conduits end electrouncnetic niesns sldspted to set no an induced electric currentin metalcontained in said receptacles and con- 3. In e furnaceof-the ty e setforth, at hearth provided withgefplum ity of receptacles for moltenmetal, each having a longitudinally inclined bottom, laterally closedinclined conduitsj' connecting opposite ends of said'receptscles anduniting some in an endless system or crucible and electro-ningneticmeans adapted to set up an induced electric current in metal containedin said receptacles and conduits. Y

4.,111 a furnace of the type set forth,n hearth provided with splurality of open channels of greet-er depth at one end then theother, eplurality of laterally closed inclined conduits connectin the shallowend of each channel Wihlilfi end of the adjacent smear channel andelectro-mzignetic means adapted to set up an induced electric current inmetal contained in said channels and conduits.

5. In a furnace of the ty e set forth a plurality of open channels eachaving a longitudinally inclined. bottom, the shallow end of eechchannel heii'ig adjacent the deep end of the next succeeding channel,said channels being united in an endless system or crucible by laterallyclosed inclined conduits and electro-inagnetic means adapted to set upan induced electric current in metal contained in said channels andconduits.

In testimony whereof I here hereunto set my hand in presence of twowitnesses.

GUSTAVE GIN.

'Witnesses: I

HENRI Ronnie, HERNANDO DE SOTO.

